The route developers have put a lot of effort into keeping the coastal climbing safe, and most of the bolts in seaside cliffs are glue-in inox anchors or inox bolts. Despite this, be always aware that coast climbing is especially dagnerous and check the guidebooks to see the re-bolting dates. Since winters are very humid, some effort is also put into cleaning the moss off some routes in spring, so contribute when possible (without harming any protected species).
There is an emerging clean climbing current, so even though in some old areas there are bolted cracks, in the modern crags there is always room for trad climbing.
In general, most of the local climbers share their new developments and are very kind to visitors, with only a few anecdotal exceptions for some specific areas.